General Information
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Chemical Formula: |
Be3(Sc,Al)2Si6O18 |
Environment: |
Pegmatites and alpine-vein rocks. |
Locality: |
Lake Maggiore, Italy. |
Name Origin: |
Named after the Italian engineer, A. E. Bazzi. |
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Classification
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Dana Class: |
61.1.1.2 (61)Six-Membered Rings(61.1)with [Si6O18] rings; possible (OH) and Al substitution (61.1.1)Beryl group |
Strunz Class: |
VIII/E.12-20 - Silicates [Cyklosilicates, six rings [Si6O18]12- (Beryl series).] |
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Crystallography
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Axial Ratios: |
a:c = 1:0.9626 |
Cell Dimensions: |
a = 9.521, c = 9.165, Z = 2; V = 719.50 |
Crystal System: |
Hexagonal - Dihexagonal Dipyramidal H-M Symbol (6/m 2/m 2/m) Space Group: P6/mcc |
X Ray Diffraction: |
By Intensity(I/Io): 2.94(1) 3.29(1) 1.65(0.8) |
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Physical Properties
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Cleavage: |
[0001] Indistinct |
Color: |
azure blue or dark blue. |
Density: |
2.8 |
Diaphaniety: |
Translucent to subtranslucent |
Habits: |
Crystalline - Fine - Occurs as well-formed fine sized crystals., Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline)., |
Hardness: |
6.5 - Pyrite |
Luminescence: |
Non-fluorescent. |
Luster: |
Vitreous (Glassy) |
Streak: |
pale bluish white |
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Optical Properties
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Dichroism (e): |
pale greenish yellow. |
Dichroism (w): |
azure blue. |
Optical Data: |
Uniaxial (-), e=1.605, w=1.626, bire=0.0210. |
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Other Information
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References: |
NAME( Duda&Rejl90) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Ford32) |